Golf club head with selectively detachable face

ABSTRACT

A method of customizing a golf club head for a user&#39;s swing begins by receiving an indication of a characteristic of a user&#39;s golf swing. A club face is selected from a plurality of club faces based on the characteristic, and a club body is selected from a plurality of club bodies based on the characteristic. The selected club face and club body are then affixed together to define a golf club head. Each of the plurality of club faces and plurality of club bodies are freely interchangeable.

CROSS REFERENCE TO RELATED APPLICATIONS

The present invention is a continuation of U.S. patent application Ser.No. 14/709,964, filed on May 12, 2015, which is incorporated byreference in its entirety.

TECHNICAL FIELD

The present invention relates generally to a method of providing acustomizable golf club head.

BACKGROUND

A golf club may generally include a club head disposed on the end of anelongate shaft. During play, the club head may be swung into contactwith a stationary ball located on the ground in an effort to project theball in an intended direction and with a desired vertical trajectory.

Many design parameters must be considered when forming a golf club head.For example, the design must provide enough structural resilience towithstand repeated impact forces between the club and the ball, as wellas between the club and the ground. The club head must conform tomaximum size requirements set by different rule setting associations,and the face of the club must not have a coefficient of restitutionabove a predefined maximum (measured according to applicable standards).Assuming that certain predefined design constraints are satisfied, aclub head design is typically quantified by the magnitude and locationof the center of gravity, as well as the head's moment of inertia aboutthe center of gravity and/or the shaft.

The club's moment of inertia relates to the club's resistance torotation (particularly during an off-center hit), and is often perceivedas the club's measure of “forgiveness.” In typical driver designs, highmoments of inertia are desired to reduce the club's tendency to push orfade a ball. Achieving a high moment of inertia generally involvesplacing mass as close to the perimeter of the club as possible (tomaximize the moment of inertia about the center of gravity), and asclose to the toe as possible (to maximize the moment of inertia aboutthe shaft).

While the moment of inertia affects the forgiveness of a club head, thelocation of the center of gravity behind the club face (and above thesole) generally affects the trajectory of a shot for a given face loftangle. A center of gravity that is positioned as far rearward (away fromthe face) and as low (close to the sole) as possible typically resultsin a ball flight that has a higher trajectory than a club head with acenter of gravity placed more forward and/or higher.

While a high moment of inertia is obtained by increasing the perimeterweighting of the club head, an increase in the total mass/swing weightof the club head (i.e., the magnitude of the center of gravity) has astrong, negative effect on club head speed and hitting distance. Saidanother way, to maximize club head speed (and hitting distance), a lowertotal mass is desired; however a lower total mass generally reduces theclub head's moment of inertia (and forgiveness).

In the tension between swing speed (mass) and forgiveness (moment ofinertia), it may be desirable to place varying amounts of mass inspecific locations throughout the club head to tailor a club'sperformance to a particular golfer or ability level. In this manner, thetotal club head mass may generally be categorized into two categories:structural mass and discretionary mass.

Structural mass generally refers to the mass of the materials that arerequired to provide the club head with the structural resilience neededto withstand repeated impacts. Structural mass is highlydesign-dependant, and provides a designer with a relatively low amountof control over specific mass distribution. On the other hand,discretionary mass is any additional mass that may be added to the clubhead design for the sole purpose of customizing the performance and/orforgiveness of the club. In an ideal club design, the amount ofstructural mass would be minimized (without sacrificing resiliency) toprovide a designer with a greater ability to customize club performance,while maintaining a swing weight that is expected by the consumer.

SUMMARY

A method of customizing a golf club head for a user's swing begins byreceiving an indication of a characteristic of a user's golf swing. Aclub face is selected from a plurality of club faces based on thecharacteristic, and a club body is selected from a plurality of clubbodies based on the characteristic. The selected club face and club bodyare then affixed together to define a golf club head. Each of theplurality of club faces and plurality of club bodies are freelyinterchangeable.

Each club face may be formed of metal and has a parameter that isdifferent than the same parameter for every other club face in theplurality of club faces. This variable parameter may be one of: loftangle; face angle; bulge radius; roll radius; mass; audible impactfrequency; thickness; and coefficient of restitution. Furthermore, eachclub body may be primarily formed from a polymer and has a weightparameter that is different than the same weight parameter for everyother club body in the plurality of club bodies. The variable weightparameter may be one of: total mass; and mass distribution.

In some embodiments, a kit of parts may be provided for assembling agolf club head with customized attributes. The kit includes a pluralityof club faces, a plurality of club bodies, and a plurality of mechanicalfasteners. Each club face of the plurality of club faces is formed ofmetal and has a parameter that is different than the same parameter forevery other club face in the plurality of club faces. The parameter maybe one of: loft angle; face angle; bulge radius; roll radius; mass;audible impact frequency; thickness; and coefficient of restitution.Each club body of the plurality of club bodies is primarily formed froma polymer and has a weight parameter that is different than the sameweight parameter for every other club body in the plurality of clubbodies. The weight parameter being one of: total mass; and massdistribution. Finally each mechanical fastener is adapted to extendthrough a respective opening in a selected club face and into a selectedclub body to provide an assembled golf club head.

The above features and advantages and other features and advantages ofthe present invention are readily apparent from the following detaileddescription of the best modes for carrying out the invention when takenin connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic front view of a golf club having a detachableface.

FIG. 2 is a schematic exploded view of the golf club head of FIG. 1.

FIG. 3 is a schematic cross sectional view of the golf club head of FIG.1, taken along line 3-3.

FIG. 4 is a schematic cross sectional view of the golf club head of FIG.1, taken along line 3-3 and in an opposite direction from FIG. 3.

DETAILED DESCRIPTION

Referring to the drawings, wherein like reference numerals are used toidentify like or identical components in the various views, FIG. 1illustrates a schematic perspective view of a wood-type golf club head10 (i.e., “club head 10”) that generally includes a face portion 12(i.e., the “face 12”) and a body portion 14 (i.e., the “body 14”). Asgenerally illustrated in FIG. 2, the club head 10 may be mounted on theend of an elongate shaft 16, which may be gripped and swung by a user toimpart a generally arcuate motion to the club head 10.

The face 12 of the club head 10 may generally include a ball-strikingportion 18 having a hitting surface 20 that is intended to contact agolf ball during a normal swing. The hitting surface 20 may be a planarsurface, or may have a slight convex/arcuate curvature (i.e. bulgeand/or roll) that extends out from the club head 10. Additionally, as iscommonly understood, the hitting surface 20 may be disposed at an angleto a vertical plane when the club is held in a neutral hitting position.This angle may be generally referred to as the loft angle or slope ofthe club. Wood-type club heads (including hybrid woods), such asillustrated in FIGS. 1-4, may most commonly have a loft angle of fromabout 8.5 degrees to about 24 degrees, though other loft angles arepossible and have been commercially sold.

The body 14 of the club head 10 may generally be configured to supportthe face 12 and to provide a connection means between the face 12 andthe elongate shaft 16. Referring again to FIG. 1, the body 14 maygenerally include a lower portion 22 (i.e., a “sole 22”) and an upperportion 24 (i.e., a “crown 24”). For the purpose of this description,the crown 24 may meet the sole 22 where the surface has a verticaltangent when the club head 10 is held in a neutral hitting position(i.e., a position where the shaft 16 is maintained entirely in avertical plane and at a prescribed lie angle relative to a horizontalground plane). In practice, a portion of the sole 22 near thistransition point may also be referred to as the skirt 26. Finally, theclub head 10 includes a hosel 28 that is configured to receive a shaftadapter and/or otherwise couple with the elongate shaft 16.

Detachable Cup Face

In one embodiment, the face 12 may have a cup-face styleconstruction/design that includes a side-wall portion 38 extending fromthe perimeter of the ball-striking portion 18 toward the rear of theclub head 10. The side-wall portion 38 and the ball-striking portion 18may form a concave recess opposite the hitting surface 20 (i.e., havinga cup-like appearance). Such a face construction enables the attachmentpoint between the face 12 and the body 14 to be positioned behind thehitting surface 20. This is in contrast to other plate-like faceconstructions that require attachment at or around the perimeter of thehitting surface 20, itself. By positioning the attachment apart from thehitting surface, it is less likely that any attachment means (e.g., aweld, screw, or the like) would influence the flexural properties of thehitting surface 20. Conversely, in plate-like face constructions, weldbeads and/or thermal tempering may directly affect the stiffness of theperimeter of the hitting surface 20.

Additionally, the face 12 may be formed from a material that maysuitably withstand a direct impact with a golf ball. While such amaterial may preferably be metallic, such as a titanium alloy, in otherembodiments, it may include one or more polymer layers, carbon-fiberlayups, or the like. In still other embodiments, the face 12 may beentirely formed from a polymeric material that is designed to withstandlarge impact loads.

FIG. 3 generally illustrates a schematic cross-sectional view 40 takenalong section 3-3 shown in FIG. 1. As shown, the face 12 and the body 14may cooperate to surround and/or define an internal volume/cavity 44.Additionally, the cup face 12 may be dimensioned to allow a portion ofthe body 14 to be received and selectively secured within the concaverecess formed by the cup face 12. In one configuration, the face 12 maybe secured to the body 14 via one or more mechanical fasteners 46 thatextend through the sidewall 38 and into the body 14. The mechanicalfasteners 46 may include one or more screws, cams, or other such devicesthat may restrain the face 12 from being removed from the body 14 whilein place, though may provide a non-destructive means of separating theface 12 and the body 14 when removed.

Enabling removal of the face 12 may provide certain benefits that arenot found in conventional fixed face designs. For example,interchangeable faces may be used to selectively vary at least onegeometric face parameter such as, for example, the face angle, the loftangle, the bulge radius, or the roll radius. Likewise, interchangeablefaces may also be used to selectively vary at least one dynamic responseparameter such as, for example, the club head center of gravity, thetotal mass of the club head, or the coefficient of restitution of theface. Finally, interchangeable faces may also be used to alleviatedurability concerns that may result from certain thin face designs.

With regard to altering at least one geometric face parameter of theclub head 10, different users may benefit from differing face geometriesaccording to their swing characteristics. For example, a user that has atendency to slice their drive, may benefit from a face angle that has adraw bias. Likewise, a user with a slow swing speed may benefit from agreater loft angle than a user with a fast swing speed. Finally, a userthat has a tendency to impact the ball away from the center of the facemay benefit from a clubface that has an increased bulge radius or rollradius.

While the geometric face parameters may relate to the specific geometryof the club face 12, the dynamic response parameters may affect thebehavior of the club head 10 throughout the swing and impact. Differentfaces may be specifically designed to alter the location of the centerof gravity of the club head 10 or alter various moments of inertia ofthe club head. This may be accomplished by changing the distribution ofweight between the heel and toe, between the crown and sole and/oraround the perimeter of the hitting surface 20. For example, placingadditional mass toward the outer perimeter of the club head 10 and/ortoward the toe may increase the club head's moment of inertia(resistance to twisting). Likewise, placing additional weight toward thesole may lower the club head's center of gravity, which generallyincreases launch angle and spin. Additionally, by enabling removal ofthe face 12, weights may be selectively placed within the body, such asby affixing to a predetermined weight port.

Finally, from a durability perspective, a removable face may allowthinner hitting surfaces to be used without as much concern for the longterm durability of the club head 10. The durability of a face 10 istypically measured by successively impacting the face with apredetermined number of golf balls traveling at a high rate of speed.The test is often performed at various locations across the club head10, and the club head must not show any signs of structural damagefollowing a test. In fixed face designs, the club face is oftenoverdesigned and/or made significantly thicker to pass such a durabilitytest at professional tour-level swing speeds. By providing a means toreplace a damaged face, the durability standards may be reduced topermit thinner face designs. Alternatively, faces may be provided tomore closely correlate with the end user's actual swing speed ratherthan always overdesigning the face to satisfy tour-level conditions.

Polymeric Body

To reduce structural mass beyond what is economically viable with metalalloys, the body 14 of the club head 10 may be formed from a polymericmaterial, which is less dense than traditional metal body designs. Topromote design flexibility, the polymeric material may be molded intoshape using any of the number of molding techniques, such as, injectionmolding, compression molding, blow molding, or the like. While weightsavings and design flexibility are important, the polymeric materialmust also be strong enough to withstand the stress that is experiencedwhen the club head 10 impacts a ball. To accomplish this, it ispreferable to use a material that has a tensile strength of greater thanabout 200 MPa (according to ASTM D638), or more preferably greater thanabout 250 MPa. Additionally, for ease of molding, if the polymericmaterial is filled, then it desirably has a resin content of greaterthan about 50%, or even greater than about 55% by weight. One suchmaterial may include, for example, a thermoplastic aliphatic orsemi-aromatic polyamide that is filled with chopped fiber, such aschopped carbon fiber or chopped glass fiber. Other materials may includepolyimides, polyamide-imides, polyetheretherketones (PEEK),polycarbonates, engineering polyurethanes, and/or other similarmaterials. In one configuration, the polymeric body 14 may be devoid ofany metallic support structure or frame that directly couples with theface 12.

In one configuration, the polymeric body 14 may be integrally formed asa single, continuous piece. An integral design may have strengthbenefits by reducing seams, weld lines, or other parting lines, howeverit may also increase the complexity of the molding process. In otherconfigurations, the body 14 may be formed from multiple components thatare fused together through, for example, ultrasonic welding, laserwelding, or the use of adhesives. For example, in one embodiment, thesole 22, crown 24, and hosel 28 may each be formed through a separatemolding process and then subsequently fused together.

As noted above, and shown in the figures, the hosel 28 may be formedfrom a polymeric material, similar to the crown 24 and the sole 22.Referring to FIG. 1, the hosel 28 generally defines a recess 60 that isconfigured to receive a golf club shaft 16 and/or a shaft adapter 62. Inone configuration, the hosel 28 includes a plurality of splines 64disposed on an inward-facing surface that surrounds the recess 60. Thesplines 64 are intended to inhibit any relative rotation between theshaft 16 and the golf club head 10 once the shaft 16 or shaft adapter 62is inserted within the recess 60.

In one configuration, the hosel 28 may be formed through similar moldingtechniques as the remainder of the body, and using similar polymericmaterials. When formed in this manner, the hosel 28 may avoid any needfor metallic inserts to be secured within the recess 60. Morespecifically, by having flexural characteristics that more closely matchthose of the shaft adapter 62 and or certain composite shafts, boundarylayer incompatibilities may be minimized, which reduces wear at theinterface and increases durability.

In general, the body 14 of the present design accomplishes fourobjectives: supporting the face 12; structurally coupling the face 12with the shaft via the hosel 28; moving the center of gravity of theclub head 10 rearward of the face 12 and/or hitting surface 20; and,increasing the moment of inertia of the club head 10 to allow the clubhead 10 to strike through the ball and minimize any twisting. A polymerbody construction may accomplish the first two objectives at a lowerrequired structural weight than conventional metal body construction. Indoing so, the polymer body construction may provide a greater amount ofdiscretionary weight that can be strategically placed about the clubhead (to better accomplish the last two objectives).

In one configuration, to secure the face 12 to the body 14, each of theplurality of mechanical fasteners 46 may be either directly received bythe polymer, or may be received by an inlaid object, such as a metalinsert. The mechanical fasteners 46 may be directly received, forexample, by providing a threaded recess directly in the polymer. Ifinserts are used, then each insert may have, for example, a threadedinternal section that receives one fastener. In one configuration, eachinsert may be separately placed in the body such that the polymericmaterial surrounds each insert separately and/or such that the insertsare coupled to each other only via the polymer.

For weighting purposes, the polymer body 14 may include one or morediscretionary weights, such as captured metallic inserts, that may beused to alter the magnitude and/or position of the club head center ofmass and/or one or more moments of inertia of the club head 10. Thesediscretionary weights are located apart from the face 12 and coupled tothe face 12 via the polymeric material. In one configuration, thediscretionary weights are separated from the face 12 by a minimumdistance that is, for example, greater than about 10 mm. In oneembodiment, as shown in FIG. 3, the discretionary weight may include ametallic band 70 that is disposed about a portion of the perimeter ofthe club head 10 (e.g., where the sole 22 meets the crown 24). Such aweight may increase the moment of inertia about a vertical axis, and maymove the center of mass rearward of the face. In one embodiment, thisband 70 may have a varying thickness to enable more precise control overthe location of the center of gravity and the various moments ofinertia. In other embodiments, the discretionary weight may include adoped portion of the polymeric body 14, a weighted medallion that isadhered to the inside or outside of the body 14, or a screw-in ortwist-lock removable weight.

In still other configurations, the metallic inserts may include one ormore metal objects, such as plates or discs that are overmolded by thepolymer within the sole 22, crown 24, intersitital space, or otherportions of the body 14. Due to the cost effective nature of polymermolding, a manufacturer may use these techniques to produce a pluralityof club head bodies that each have a different mass and/or massdistribution. In still other configurations, the metallic inserts mayhave a threaded portion that can receive a screw-in style weight.

Club Customization

Using the present design, a club head may be assembled in a manner thatis specific to the characteristics of a user's swing. More specifically,constructing a club head may include the steps of: selecting a face 12from a plurality of faces, each of the plurality of faces having one ormore different parameters selected from the loft angle, the face angle,the bulge radius, the roll radius, the mass, the audible impactfrequency, and the coefficient of restitution across the club face;selecting a body 14 from a plurality of bodies, each of the plurality ofbodies having a different weight parameter selected from a total massand a mass distribution.

In one configuration, for example, the plurality of faces may include atleast three different faces, each having a different coefficient ofrestitution intended for a user with a different swing speed (e.g.,slow, average, fast). In another configuration, the plurality of facesmay include at least nine different faces, with each face having one ofthree different coefficient of restitutions and one of three differentface orientation profiles (e.g., low, medium, and high loft, or draw,neutral, fade biased face angle).

In a similar manner, in one configuration, the plurality of bodies mayinclude at least three bodies, each having a different total massintended for users of differing swing speeds (e.g., light, average, andheavy bodies, intended for users of slow, average, and fast swingspeeds, respectively). In another configuration, the plurality of bodiesmay include at least nine different bodies, with each body having one ofthree different total masses and one of three different weight biasingprofiles (e.g, toe, center, and heal-biased weighting; or face, mid, andrear-biased weighting).

In another embodiment, a shaft adapter such as described in U.S. PatentApplication No 2013/0324291 to Arluna et al, which is incorporated byreference in its entirety, may be used to vary the loft angle and faceangle, while the plurality of faces may be used to vary the coefficientof restitution, and the plurality of bodies may be used to vary thetotal club head mass and/or one or more dynamic parameters such as adynamic loft or a ball-spin tendency.

In addition to providing different weight profiles, the cosmeticappearance may also be more substantially varied through the polymerbody construction. In general, polymer molding techniques can provide amore complex and detailed design than metal fabrication techniques arecapable of. Additionally, for a similar design, polymer molding isgenerally less expensive than metal fabrication. As such, the pluralityof bodies may also include varying cosmetic designs that range fromconservative (i.e., a generally uniform shell) to aggressive (i.e.,including many recesses, accent ribs, or colored panels).

By permitting a mix and match style of club head creation, retailers maybe able to offer a more customized golf club that is tailoredspecifically to a user's preferences or swing. This interchangeablecomponent structure also can eliminate the need to inventory everypossible combination of components.

While various embodiments have been described, the description isintended to be exemplary, rather than limiting and it will be apparentto those of ordinary skill in the art that many more embodiments andimplementations are possible. Accordingly, the invention is not to berestricted except in light of the attached claims and their equivalents.Also, various modifications and changes may be made within the scope ofthe attached claims.

“A,” “an,” “the,” “at least one,” and “one or more” are usedinterchangeably to indicate that at least one of the item is present; aplurality of such items may be present unless the context clearlyindicates otherwise. All numerical values of parameters (e.g., ofquantities or conditions) in this specification, including the appendedclaims, are to be understood as being modified in all instances by theterm “about” whether or not “about” actually appears before thenumerical value. “About” indicates that the stated numerical valueallows some slight imprecision (with some approach to exactness in thevalue; about or reasonably close to the value; nearly). If theimprecision provided by “about” is not otherwise understood in the artwith this ordinary meaning, then “about” as used herein indicates atleast variations that may arise from ordinary methods of measuring andusing such parameters. In addition, disclosure of ranges includesdisclosure of all values and further divided ranges within the entirerange. Each value within a range and the endpoints of a range are herebyall disclosed as separate embodiment. The terms “comprises,”“comprising,” “including,” and “having,” are inclusive and thereforespecify the presence of stated items, but do not preclude the presenceof other items. As used in this specification, the term “or” includesany and all combinations of one or more of the listed items. When theterms first, second, third, etc. are used to differentiate various itemsfrom each other, these designations are merely for convenience and donot limit the items.

1. A method of providing a golf club head with customizable parameters,the method comprising: selecting a club face from a plurality of clubfaces, wherein each club face of the plurality of club faces is formedof metal and has a parameter that is different than the same parameterfor every other club face in the plurality of club faces, the parameterbeing one of: loft angle; face angle; bulge radius; roll radius; mass;audible impact frequency; thickness; and coefficient of restitution;selecting a club body from a plurality of club bodies, wherein each clubbody of the plurality of club bodies is formed from a polymer and has aweight parameter that is different than the same weight parameter forevery other club body in the plurality of club bodies, the weightparameter being one of: total mass; and mass distribution; wherein eachof the plurality of club faces can interchangeably be affixed to each ofthe plurality of club bodies; and affixing the club face to the clubbody to form a golf club head.
 2. The method of claim 1, furthercomprising receiving an indication of a swing speed of a user; andwherein at least one of the club face and the club body is selected onthe basis of the received indication of swing speed.
 3. The method ofclaim 2, wherein the plurality of club faces includes three club faces,and wherein the parameter is coefficient of restitution.
 4. The methodof claim 2, wherein the plurality of club bodies includes three clubbodies, and wherein the weight parameter is total weight.
 5. The methodof claim 1, wherein each of the plurality of club faces has a ballstriking portion defining a hitting surface, and a side-wall extendingaround the ball striking portion; and wherein affixing the club face tothe club body further includes sliding the club face over a portion ofthe club body such that the side-wall of the club face abuts and isradially outward from an overlapped portion of the club body.
 6. Themethod of claim 5, wherein affixing the club face to the club bodyfurther includes threading a plurality of mechanical fasteners throughthe sidewall into the club body.
 7. The method of claim 6, wherein theclub body includes a plurality of inserts within the overlapped portionof the club body; and wherein threading a plurality of mechanicalfasteners through the sidewall into the club body includes threadingeach of the plurality of mechanical fasteners into a respective one ofthe plurality of inserts.
 8. The method of claim 6, wherein the clubbody defines a crown and a sole of the golf club head, and wherein theplurality of mechanical fasteners includes a first plurality offasteners and a second plurality of fasteners; and wherein each fastenerof the first of the plurality of fasteners is threaded into the crown,and wherein each fastener of the second of the plurality of fasteners isthreaded into the sole.
 9. The method of claim 1, wherein each club bodyof the plurality of club bodies is formed from a filled or unfilledthermoplastic polymer having a resin content of greater than about 50%by weight.
 10. The method of claim 1, wherein the golf club head is awood-type golf club head such that the club face and club body cooperateto define a closed volume therebetween.
 11. A method of customizing agolf club head for a user's swing, the method comprising: receiving anindication of a characteristic of a user's golf swing; and selecting aclub face from a plurality of club faces based on the characteristic,wherein each club face of the plurality of club faces is formed of metaland has a parameter that is different than the same parameter for everyother club face in the plurality of club faces, the parameter being oneof: loft angle; face angle; bulge radius; roll radius; mass; audibleimpact frequency; thickness; and coefficient of restitution; selecting aclub body from a plurality of club bodies based on the characteristic,wherein each club body of the plurality of club bodies is formed from apolymer and has a weight parameter that is different than the sameweight parameter for every other club body in the plurality of clubbodies, the weight parameter being one of: total mass; and massdistribution; wherein each of the plurality of club faces caninterchangeably be affixed to each of the plurality of club bodies; andaffixing the club face to the club body by threading a plurality ofmechanical fasteners through the club face into the club body.
 12. Themethod of claim 11, wherein each of the plurality of club faces has aball striking portion defining a hitting surface, and a side-wallextending around the ball striking portion; and wherein affixing theclub face to the club body further includes sliding the club face over aportion of the club body such that the side-wall of the club face abutsand is radially outward from an overlapped portion of the club body. 13.The method of claim 12, wherein each of the plurality of mechanicalfasteners is threaded through the sidewall into the club body.
 14. Themethod of claim 11, wherein the club body includes a plurality ofinserts within the overlapped portion of the club body; and whereinthreading a plurality of mechanical fasteners through the club face intothe club body includes threading each of the plurality of mechanicalfasteners into a respective one of the plurality of inserts.
 15. Themethod of claim 11, wherein the club body defines a crown and a sole ofthe golf club head, and wherein the plurality of mechanical fastenersincludes a first plurality of fasteners and a second plurality offasteners; and wherein each fastener of the first of the plurality offasteners is threaded into the crown, and wherein each fastener of thesecond of the plurality of fasteners is threaded into the sole.
 16. Themethod of claim 11, wherein each club body of the plurality of clubbodies is formed from a filled or unfilled thermoplastic polymer havinga resin content of greater than about 50% by weight.
 17. The method ofclaim 11, wherein the characteristic is swing speed.
 18. A kit of partsfor assembling a golf club head with customized attributes, the kitcomprising: a plurality of club faces, wherein each club face of theplurality of club faces is formed of metal and has a parameter that isdifferent than the same parameter for every other club face in theplurality of club faces, the parameter being one of: loft angle; faceangle; bulge radius; roll radius; mass; audible impact frequency;thickness; and coefficient of restitution; a plurality of club bodies,wherein each club body of the plurality of club bodies is formed from apolymer and has a weight parameter that is different than the sameweight parameter for every other club body in the plurality of clubbodies, the weight parameter being one of: total mass; and massdistribution; a plurality of threaded mechanical fasteners, eachmechanical fastener adapted to extend through a respective opening in aselected club face and into a selected club body to provide an assembledgolf club head.
 19. The kit of parts of claim 18, wherein each of theplurality of club faces can interchangeably be affixed to each of theplurality of club bodies using the plurality of mechanical fasteners toprovide a golf club head with customized attributes.
 20. The kit ofparts of claim 18, wherein the plurality of club faces includes at leastthree club faces, and wherein the plurality of club bodies includes atleast three club bodies.